The AME fits neither synchrotron nor dust, the spinning-grain fix needs region-by-region retuning, the PAH correlation that should confirm the carriers comes back inconsistent (Hensley 2016; Dickinson 2018), and the polarization sits below one percent where aligned spinning grains should deliver several. The rotation physics is being driven by something the local models lack.
Standard spinning-dust models spin the grains with local forces, gas collisions, radiation torques, plasma drag, and align them with the local magnetic field, so spectrum and polarization should follow from local ISM parameters. The persistent mismatches and the missing polarization say the rotation distribution has a component local physics does not set.
SCT's angular momentum inheritance does not stop at galaxies. The J ∝ M^(5/3) ladder runs through every tier of condensed structure (P31, P32), and the dust-bearing clouds, formed from material whose rotation history descends from the same deposited vector, carry an inherited component in their bulk kinematics and in their grain size and composition mix. Individual grain spins rethermalize in days to years, so the memory does not live in any single grain: it lives in the cloud-scale vorticity and material composition that set the boundary conditions the local spin-up physics works inside, biasing the resulting rotation-rate distribution in a way local parameters alone neither produce nor predict. The two stubborn anomalies then resolve together: the spectrum resists local-parameter fits because part of the rotation distribution is historical rather than environmental, and the polarization is low because the spin-axis distribution is organized by the cloud's inherited kinematic architecture rather than ordered along the local magnetic field, so the emission averages toward unpolarized exactly as observed.
The carrier-correlation inconsistency follows from the companion premise: grain populations are diverse by inheritance (P25), their compositions and size distributions varying with the deposited material's history rather than tracking any single tracer like PAH abundance. The registered discriminant is directional: an inherited rotation component should correlate with the larger-scale angular momentum architecture, the Galactic J environment, rather than with local gas and radiation parameters, a statistical test the coming CMB foreground surveys can run across sightlines. The inheritance ladder is in Paper 5, From Chaos To Corotating Hierarchies.
Keystone economy: P32 carries the rotation down to the clouds that make the grains, P25 diversifies the carriers. The anomaly is the smallest reading yet of the framework's oldest vector.
The discriminant carries the kill: if next-generation foreground surveys show AME spectra and peak frequencies fully predicted by local ISM parameters once grain physics is refined, with residuals uncorrelated to any larger-scale angular momentum structure, the inherited component is unnecessary. The polarization cuts both ways: a confirmed AME polarization at the several-percent level of aligned-grain models would restore the local-alignment picture and remove the inheritance signature.